/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2013-2024 Regents of the University of California.
 *
 * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
 *
 * ndn-cxx library is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
 *
 * You should have received copies of the GNU General Public License and GNU Lesser
 * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
 */

#include "ndn-cxx/security/certificate-fetcher-direct-fetch.hpp"

#include "ndn-cxx/lp/tags.hpp"
#include "ndn-cxx/security/validation-policy-simple-hierarchy.hpp"

#include "tests/test-common.hpp"
#include "tests/unit/security/validator-fixture.hpp"

#include <boost/mp11/list.hpp>
#include <boost/range/adaptor/sliced.hpp>
#include <boost/range/adaptor/strided.hpp>

namespace ndn::tests {

using namespace ndn::security;

BOOST_AUTO_TEST_SUITE(Security)
BOOST_AUTO_TEST_SUITE(TestCertificateFetcherDirectFetch)

struct Cert {};
struct Nack {};
struct Timeout {};

template<class Response>
class CertificateFetcherDirectFetchFixture : public HierarchicalValidatorFixture<ValidationPolicySimpleHierarchy,
                                                                                 CertificateFetcherDirectFetch>
{
public:
  enum class ResponseType {
    INFRASTRUCTURE,
    DIRECT,
    BOTH
  };

  CertificateFetcherDirectFetchFixture()
    : data("/Security/ValidatorFixture/Sub1/Sub3/Data")
    , interest("/Security/ValidatorFixture/Sub1/Sub3/Interest")
    , interestNoTag("/Security/ValidatorFixture/Sub1/Sub3/Interest2")
  {
    Identity subSubIdentity = addSubCertificate("/Security/ValidatorFixture/Sub1/Sub3", subIdentity);
    cache.insert(subSubIdentity.getDefaultKey().getDefaultCertificate());

    m_keyChain.sign(data, signingByIdentity(subSubIdentity));
    m_keyChain.sign(interest, signingByIdentity(subSubIdentity));
    m_keyChain.sign(interestNoTag, signingByIdentity(subSubIdentity));

    data.setTag(make_shared<lp::IncomingFaceIdTag>(123));
    interest.setTag(make_shared<lp::IncomingFaceIdTag>(123));

    processInterest = [this] (const Interest& interest) {
      auto nextHopFaceIdTag = interest.template getTag<lp::NextHopFaceIdTag>();
      if (nextHopFaceIdTag == nullptr) {
        if (responseType == ResponseType::INFRASTRUCTURE || responseType == ResponseType::BOTH) {
          makeResponse(interest);
        }
      }
      else {
        if (responseType == ResponseType::DIRECT || responseType == ResponseType::BOTH) {
          makeResponse(interest);
        }
      }
    };
  }

  void
  makeResponse(const Interest& interest)
  {
    if constexpr (std::is_same_v<Response, Cert>) {
      auto cert = cache.find(interest);
      if (cert == nullptr) {
        return;
      }
      face.receive(*cert);
    }
    else if constexpr (std::is_same_v<Response, Nack>) {
      face.receive(makeNack(interest, lp::NackReason::NO_ROUTE));
    }
    else {
      // do nothing
    }
  }

  void
  setResponseType(ResponseType type)
  {
    responseType = type;
  }

public:
  Data data;
  Interest interest;
  Interest interestNoTag;
  ResponseType responseType = ResponseType::INFRASTRUCTURE;
};

using FailureModes = boost::mp11::mp_list<Nack, Timeout>;

BOOST_FIXTURE_TEST_CASE(ValidateSuccessData, CertificateFetcherDirectFetchFixture<Cert>)
{
  VALIDATE_SUCCESS(this->data, "Should get accepted, normal and/or direct interests bring certs");
  BOOST_CHECK_EQUAL(this->face.sentInterests.size(), 4);

  // odd interests
  for (const auto& sentInterest : this->face.sentInterests | boost::adaptors::strided(2)) {
    BOOST_CHECK(sentInterest.template getTag<lp::NextHopFaceIdTag>() != nullptr);
  }

  // even interests
  for (const auto& sentInterest : this->face.sentInterests |
                                    boost::adaptors::sliced(1, this->face.sentInterests.size()) |
                                    boost::adaptors::strided(2)) {
    BOOST_CHECK(sentInterest.template getTag<lp::NextHopFaceIdTag>() == nullptr);
  }
}

BOOST_FIXTURE_TEST_CASE(ValidateSuccessDataDirectOnly, CertificateFetcherDirectFetchFixture<Cert>)
{
  setResponseType(ResponseType::DIRECT);
  static_cast<CertificateFetcherDirectFetch&>(validator.getFetcher()).setSendDirectInterestOnly(true);

  VALIDATE_SUCCESS(this->data, "Should get accepted, direct interests bring certs");
  BOOST_CHECK_EQUAL(this->face.sentInterests.size(), 2);

  for (const auto& sentInterest : this->face.sentInterests) {
    BOOST_CHECK(sentInterest.template getTag<lp::NextHopFaceIdTag>() != nullptr);
  }
}

BOOST_FIXTURE_TEST_CASE_TEMPLATE(ValidateFailureData, T, FailureModes,
                                 CertificateFetcherDirectFetchFixture<T>)
{
  VALIDATE_FAILURE(this->data, "Should fail, as all interests either NACKed or timeout");
  BOOST_TEST(this->lastError.getCode() == ValidationError::CANNOT_RETRIEVE_CERT);
  // Direct fetcher sends two interests each time - to network and face
  // 3 retries on nack or timeout (2 * (1 + 3) = 8)
  BOOST_TEST(this->face.sentInterests.size() == 8);

  // odd interests
  for (const auto& sentInterest : this->face.sentInterests | boost::adaptors::strided(2)) {
    BOOST_CHECK(sentInterest.template getTag<lp::NextHopFaceIdTag>() != nullptr);
  }

  // even interests
  for (const auto& sentInterest : this->face.sentInterests |
                                    boost::adaptors::sliced(1, this->face.sentInterests.size()) |
                                    boost::adaptors::strided(2)) {
    BOOST_CHECK(sentInterest.template getTag<lp::NextHopFaceIdTag>() == nullptr);
  }
}

BOOST_FIXTURE_TEST_CASE_TEMPLATE(ValidateFailureDataDirectOnly, T, FailureModes,
                                 CertificateFetcherDirectFetchFixture<T>)
{
  this->setResponseType(CertificateFetcherDirectFetchFixture<T>::ResponseType::DIRECT);
  static_cast<CertificateFetcherDirectFetch&>(this->validator.getFetcher()).setSendDirectInterestOnly(true);

  VALIDATE_FAILURE(this->data, "Should fail, as all interests either NACKed or timeout");
  BOOST_TEST(this->lastError.getCode() == ValidationError::CANNOT_RETRIEVE_CERT);
  // Direct fetcher sends two interests each time - to network and face
  // 3 retries on nack or timeout (1 + 3 = 4)
  BOOST_TEST(this->face.sentInterests.size() == 4);

  for (const auto& sentInterest : this->face.sentInterests) {
    BOOST_CHECK(sentInterest.template getTag<lp::NextHopFaceIdTag>() != nullptr);
  }
}

BOOST_FIXTURE_TEST_CASE_TEMPLATE(ValidateFailureDataNoTagDirectOnly, T, FailureModes,
                                 CertificateFetcherDirectFetchFixture<T>)
{
  this->setResponseType(CertificateFetcherDirectFetchFixture<T>::ResponseType::DIRECT);
  static_cast<CertificateFetcherDirectFetch&>(this->validator.getFetcher()).setSendDirectInterestOnly(true);

  this->data.template removeTag<lp::IncomingFaceIdTag>();
  this->interest.template removeTag<lp::IncomingFaceIdTag>();

  VALIDATE_FAILURE(this->data, "Should fail, as no interests are expected");
  BOOST_TEST(this->lastError.getCode() == ValidationError::CANNOT_RETRIEVE_CERT);
  BOOST_TEST(this->face.sentInterests.size() == 0);
}

BOOST_FIXTURE_TEST_CASE(ValidateSuccessInterest, CertificateFetcherDirectFetchFixture<Cert>)
{
  VALIDATE_SUCCESS(this->interest, "Should get accepted, normal and/or direct interests bring certs");
  BOOST_CHECK_EQUAL(this->face.sentInterests.size(), 4);

  // odd interests
  for (const auto& sentInterest : this->face.sentInterests | boost::adaptors::strided(2)) {
    BOOST_CHECK(sentInterest.template getTag<lp::NextHopFaceIdTag>() != nullptr);
  }

  // even interests
  for (const auto& sentInterest : this->face.sentInterests |
                                    boost::adaptors::sliced(1, this->face.sentInterests.size()) |
                                    boost::adaptors::strided(2)) {
    BOOST_CHECK(sentInterest.template getTag<lp::NextHopFaceIdTag>() == nullptr);
  }
}

BOOST_FIXTURE_TEST_CASE_TEMPLATE(ValidateFailureInterest, T, FailureModes,
                                 CertificateFetcherDirectFetchFixture<T>)
{
  VALIDATE_FAILURE(this->interest, "Should fail, as all interests either NACKed or timeout");
  BOOST_TEST(this->lastError.getCode() == ValidationError::CANNOT_RETRIEVE_CERT);
  // Direct fetcher sends two interests each time - to network and face
  // 3 retries on nack or timeout (2 * (1 + 3) = 4)
  BOOST_TEST(this->face.sentInterests.size() == 8);

  // odd interests
  for (const auto& sentInterest : this->face.sentInterests | boost::adaptors::strided(2)) {
    BOOST_CHECK(sentInterest.template getTag<lp::NextHopFaceIdTag>() != nullptr);
  }

  // even interests
  for (const auto& sentInterest : this->face.sentInterests |
                                    boost::adaptors::sliced(1, this->face.sentInterests.size()) |
                                    boost::adaptors::strided(2)) {
    BOOST_CHECK(sentInterest.template getTag<lp::NextHopFaceIdTag>() == nullptr);
  }
}

BOOST_AUTO_TEST_SUITE_END() // TestCertificateFetcherDirectFetch
BOOST_AUTO_TEST_SUITE_END() // Security

} // namespace ndn::tests